Concave attachment for threshing-machines.



R. C. KNAAK. GONUAVE ATTAGHMENTFOR THRESHING MACHINES. APPLICATION FILEDMAR. 11, 1909.

Patented Apr.5,1910.

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R. G. KNAAK. GONGAVE ATTACHMENT FOR THRESHING MACHINES.

APPLICATION FILED MAR. 11, 1909.

w fifie Patented Apr. 5, 1910.

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- f a T i W 535; k V lZ/Ki V 61w mu ANDREW a cnmmm c0 FHOTDVUWOGRAPHERSvmsmwslom o c A vwn w re 11 ROBERT C. KNAAK, (1F HARTSBURG. ILLINGIS.

GONCAVE ATTACHMENT F63, THEESHING-IHACHINES.

Patented Apr. 5, Hiltl.

To all whom it may concern:

Be it known that l, Ronnn'r C. KNAAK, a citizen of the United States,residing at llartsbnrg, in the county of Logan and State of lllinois,have invented a new and useful improvement in Concave Attachments forllhreshing-lilaehines, of which the following is a specification.

This invention to adjustable concavcs for threshing machines, the objectbeing to provide a concave which can be moved in respect to thethreshing cylinder so as to overcome the ditlicultics now existing ofthe threshing machine choking up.

it further object of my invention is to provide a concave withadjustable teeth whereby the rapidity of the threshing can be increasedor decreased.

A still further object of my invention is to provide novel means foradjusting the teeth. of the concave whereby any number of sets of thesame can be adjusted independently by simply operating a lever.

A still further object of my invention is to provide a casting whichcarries a concave, said casting being provided with wheels mounted on aninclined track so that by moving the casting the concave will be adustedin respect to the cylinder.

A still further object of the invention is to provide nove means forconnecting the toothed bars of the concave to links which are carried bycranks whereby any one of the same can be readily replaced if the sameshould become accidentally broken.

A. still further object of my invention is to provide an adjustableconcave for threshing machines which is exceedingly simple and cheap inconstruction and one which is composed of a few parts which are so ar--ranged and connected together that any one of the parts can be readilydetached without stopping the machine.

Jr still further object of my invention is to provide novel means foradjusting the casting carrying the concave, said means comprising ascrew adapted to be operated by a c'ank.

lVith these objects in View, my invention consists of the novel featuresof construction, combination and arrangement of parts hereinafter fullydescribed, pointed out in the claims and shown in the accompanyingdrawings, in which,

Figure 1 is a vertical sect-ion through my improved concave. Fig. 2 is afront View of the same. Fig. 3 is a perspective view of one of thetoothed. bars sho *ing the manner of connecting the link thereto. Fig. lis a detail view of a modified form of mounting the toothed bars.

In carrying out my improved invention, I. employ a casting A which isprovided with a concave portion A to which is connected the concave Bwhich is arranged under the threshing cylinder C of the threshingmachine and. secured to the upper end of the concave B is a chute 1')over which the material to be threshed passes to the cylinder. Thecasting is provided with wheels E and F arranged in different horizontalplanes and mounted on inclined tracks G which are mounted on thethreshing machine and the casting is also provided with. a cross bar Ahaving a threaded bore in which works a screw H mounted in a bracket 1and having a bevel g or H fixed on one end meshing with a bevel gear 5carried by a shaft J which is provided with a crank J for operating thesame and it will be seen that as the screw is rotated the castingcarrying the concave will be moved in respect to the cylinder. it willbe seen that by this arrangement if the machine becomes choked by thestraw it is only necessary to move the concave away from the cylinder soas to allow the same to pass therethrough.

The sides of the casting A are provided with slots fi in which aremounted toothed bars l t provided with teeth K which w rk through slotsformed in the concave portion of the casting and the concave l3 andadapted to co-act with the teeth of the threshing cyl indcr in the usualmanner. Securcl over each of the toothed bars K is a yoke L carryin a,pivoted link L which is adapted to be connected to cranks id mounted onshafts M which are journaled in the sides of the casting, said cranksbeing provided with bowed portions M so as to prevent the cranks fromengaging the shaft and will be seen that for operating the cranks thetoothed bars will be moved in the slots of the casting so as to adjusttheir position in the concave.

Extending out to the rear of the casting are arms N in which is a shaft0 carrying a plurality of levers P provided with hand levers P whichwork in connection with segmental racks Q fixed on the shaft between therespective levers and connected to each of the levers is a link it whichis connected. to the respective cranks so that as the levers areoperated the cranks will be swung so as to move th toothed bars in andout or the concave whereby the rapidity of the threshing can be reguiaed. it will be seen thatby this constriction each one of the toothedbars can be asily and uickly adjusted tor operating a lever so that ifdesired some of the toothed tars can be moved into such a position thatthe teeth will be drawn tiush with the concave.

fv hile l have shown and described t toothed bars mounted in slots andoperate. by pccul ar shaped crank a it is oi' course understood thatvarious 0 her means could be used to operate the same witho deg artingfrom the spirit of my invention.

In the inodilicativ'in shown in r'ig. 4 1 arrange coded springs S in theslots ot the casting of the concave under the oothed 1 bars for holdingthe same in their adjusted position so that the teeth will be heldwithin the concave evenly and it will be seen that by this arrangementthe toothed bars work against the tensit n of the springs when movedinwardly.

From the foregoing description it will be seen that I have provided anadjustable coucave for threshing machines which C21 moved in respect tothe threshing cylinder and at the same time provided with adjustabletoothed bars which can be operated independently which enables theoperator to adjust the same easily and quickly.

that I claim is 1. In a threshing machine. the combination with athreshing cylinder. of a casting carrying a concave slidably mountedunder said cylinder provided with adjustable teeth, said casting beingprovided with a threaded bore and a screw working in said threaded borefor adjusting said concave with respect to the threshing cylinder.

An adjustable concave for threshing machines comprising a castingprovided with wheels mounted on an inclined track said casting beingprovided with slots, a plurality of toothed bars working in said slots.a concave provided i'ith slots arranged over said casting through whichsa'd teeth work, and means tor adjusting said toothed barsindependently. together with means tor moving said eating in respect tothe cylinder.

3. In a threshing machine the combinabe r tion with a threshingcylinder, an inclined track arranged under said cylinder, a castingprovided with wheels mounted on said track, a con*ave carried by saidcasting, toothed bars slidably mounted within the casting provided withteeth extending through said concave. yokes carried by said bars, linkscarried by said yokes, cranks connected to said links, and leverscarrying links connected to said cranks for operating the same, togetherwith means for moving said casting on said track.

Jr. In a threshing machine. the combination with a threshing cylinder,of an in clined track ar 'anged under said cylinder, a concave carriedby said casting. wheels carried by the casting mounted on said track, across bar connecting the lower end of said casting provided with athreaded bore, a screw working in said threaded bore carrying a bevelgear. a second bevel gear meshing with said gear and a c 'ank carried bythe shaft carrying the second bevel gear for operating the same wherebysaid casting can be mov d in respect to the cylinder.

5. In a threshing machine the combination with a threshing cylinder. ofan inclined track ar'anged under said cylinder a casting provided withwheels mounted on said track a concave carried by said casting meanst'or moving said casting on said track, slidably mounted toothed barsmounted in the casting provided with teeth extending through theconcave, and levers and cranks for operating said toothed bars.

(3. In a threshing machine, the combination with a threshing cylinder,of a casting slidably mounted under said cylinder, provided with aconcave portion, a concave arranged over said concave portion of thecasting provided with slots. slidably mounted toothed bars :arried bythe casting provided with teethextending through the slots of the con"ave, yokes carried by said bars, links carried by said yokes. shaftscarrying cranks mounted in the casting connected to the respective link.and a plurality of levers each carrying a link connected to therespective cranks whereby said toothed bars can be operatedindependently.

ROBERT C. KNAAK. ll itnesses H. P. Jones, ED\VARD E. HALL.

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